Refrigerating apparatus



PEec. 20 1932. o. M. SUMMERS REFRIGERATING APPARATUS Filed March 51. 1930 2 Sheets-Sheet 1 1 VENTOR' ATTORNEY Dec. 29, 1932. O M, M RS 3,891,249

REFRIGERATING APPARATUS Filed March 51. 1930 2 Sheets-Sheet 2 A TTORNEY Patented Dec. 2c, 1932 entree srnrss earner oFF-ics OTTQ M. SUMMERS, 01E DAYTON; QHIO, ASSIGNOR. TO FRIGIDAIRE CORPORATION, OF DAYTON, OHIQ, A CORPORATION- OF DELAWARE REFRIGERATING APPARATUS Application filed March 81; 1930. Serial No. 440,501.

The present invention relates to refrigerating apparatus and more particularly to the control of the refrigerant in the apparatus and to the mechanism of the control.

One of the objects of the present inventlon is to provide for the more ready removal of certain Valve elements and for preventing the escape of refrigerant during such removal. v

In carrying out the above it is a further object ofthe invention to isolate the valve element, which is to be removed, from the other parts of the refrigerating apparatus so that the refrigerant will not escape from said other parts of the refrigerating apparatus' ,during removal of such valve element.

Another object of the present invent on is to provide improved means for adjustnng a float so as to control the height of the liquid refrigerant level which is normally controlled by such float.

Further objects and advantages of the present invention will be'apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the invention is clearly shown.

in the drawings Fig. l is a diagrammatic View of a refrigerating system including the present invention;

Fig. 2 is a fragmentary View of the upper end of an evaporator shown in Fig. l on a lar er scale;

ig. 3 is a longitudinal sectional view taken on line 33 of Fig. 2;

Fig. 4; 1s a fragmentary sectional view taken on line 4-4 of Fig. 3 but on a somewhat larger scale than Fig. 3;

Fig. 5 is a fragmentary sectional view taken on line 55 of Fig. 3 but along a somewhat larger scale showing a needle valve in position and a Fig. h is a view similar to Fig. 5 but n which the valve and valve operating mecha= nisrn and the lower coupling is removed.

Referring to the drawings for the purpose of illustrating the present invention have shown a reirigerating system of the coin:

presscr-condenser rpander type and in 'provement has been specifically applied to the evaporator of such system. The system herein shown includes an evaporator on the low pressure side of the refrigerating system. Refrigerant is delivered to the evaporator 20 from a receiver 21 through a. pipe 22 and is Withdrawn from the evaporator 20 by a compressor 24 through a pipe 25, the pipe 25 being connected to the low side of the compressor and preferably as shown tothe crank case. The high pressure side oi the compressor 24 is connected to a condenser 2'? which empties into the receiver 21. The compressor. is preferably driven by a motor 2% driven by a belt 29 and is started and stopped in response to temperature of the evaporator by means of the pressure within the evapoant to a zone or place to becooled. The liquidchamber is a drawn sheet metal tube 38,. one end thereof being opened and carries a ring 39 which is suitably bonded to the tube so as to prevent leaks. A head 40 is removably secured to the ring 39 and in place by bolts 41. This head is provided with an opening A valve fitting is secured to the head 49 by bolts All. circular projection e601 fits within a circular recess within the head l9 containing packing 47 for sealing the connection between the fitting 4:5 and the head iii. A boss 49 is formed on the fitting 4&5 and'extends into an opening in the head 40 which opening also receives packing 5G ior sealing the connecticn.

The fitting 4:5 merges into a valve housing 52 having an opening which is closed by re movable plug 58. This housing is connected with the liquid pipe the refrigerating sys= tern through coupling and a shut oil valve 55 (see i conduit 56 (seel ig. 6; connects the housing m with the chamber 35.

Thisconduitfor ms a hearing for a rotating shaft 58 and in order that the refrigerant flows more readily, the conduit may comprise one or a plurality of slots 59. This conduit leads .into an enlarged chamber 60 which is in alignment with the opening 453 'the head so.

@pposite the housing 52, the -fitting e15 carries a coupling 62. This coupling has a conduit 63 in longitudinal alignment with the conduit 56 and is formed similar to conduit 56. This conduit 63 connecting with a passage 64 in nipple 65 connects with the pipe and the other end thereof connects with a passage 66 formed in the hollow hoss 49. The head so carries an inwardly and upwardly extending outlet pipe 67 for withdrawing gaseous refrigerant from the free space above the liquid level in the casing 35. Thus refrigerant is delivered irom the receiver 22 through the shut off valve 55, coupling 5 housing 52, conduit 56, chamber 60 and passage 42 to the interior of the chamber and the refrigerant is withdrawn from the chainher 35 through the pipe 6?, opening 66, conduit 68, passage 64 and to the cornpressor.

The means for controlling the flow refrigerant from the high pressure side the refrigerating system to the evaporator is controlled by a float 70. desirable, tie Zioat can he filled with wood or other su' able material to prevent collapsing same in t that excessive high pressure is oresen chamber 35. The float 70 i 'votally supported at '?l on arms 2'3. -enough during operation of the system, the arms are fixed relative to shaft 58, these arms are arranged for pivotal movement about the shaft V tie member 74 is secured the a ns l3 and is screw-threaded to receive an a a sting screw 1 5. 2121 arm 76 is removaloly secured to the shaft 58 by a screw 77 and is adjustahly connected with the arm 73 through the tie memberl4 and screw 7 5, the arm 76 being screwthreaded to receive the screw '75, which screw is located in adjusted position by a loo" 6. sin opening is provided in the fit for access to screw 77 and a cured in sealing relation closing said opening.

The shaft 58 extends into th housing and provided with a square shan carries a valve arm 82. valve AS pivotally attached to the valve arm a screw 85 and cooperates with a valve ioraned coupling 54. It will he apparent drawings that a rising or lowering will cause a lowering or rising or the valve respectively. The relative position or the float with respect to the valve he lated hyvthe screw l5 and in his man liquid level in the-chambers Cue end of the shaft 58 is in the conduit opening 56 and the other end of the shaft is iournalled in a plug 87. This plug 87 is screw-threaded into the fitting and when moved inwardly from the position shown in Fig. 4 causes a longitudinal sliding movement to he imparted to the shaft 58. f2. valve 88 is formed integral with the shaft 58 and is arranged to cooperate with the vvalve seat 89 formed in the fitting 45 so that when the shaft 58 is slid longitudinally, the valve will close the conduit 56 to prevent the flow of refrigerant "from the housing 52 to the interior of the casing 35 and will prevent the flow of refrigerant from the interior of casing' 35 to the housing when the plug 53 is removed. lhe shank 91 of the plug 87 extends to the exterior or" the refrigerating system and is provided with a key hold 92 for manipulating same. This key hold is accessible when a plug 93 is removed. Facking 95 and a gland 96 therefor are provided for preventthe escape of refrigerant along the stem 91 when the plug 93 is removed.

the event that the valve 83 or its seat 86 is injured, these elements can he removed without dismantling the entire valve operating mechanism and without the escape of a material quantity of refrigerant. it s necessary only to close the shut off valve :35 and shut off valve 88 to-isolate the housing 52 orn the remainder of the system and then y removing plug 53 and nut 66 or screw 85, the valve 63, and the seat 86 can he removed. referahly the shut off valve is first closed and the compressor operated so as to withdraw a certain amount of refrigerant from the evaporator and thus substantially exhaust the housing 52 whereby when the plug is removed substantially no refrigerant, any,

so valve 69 seats on valve seat 100 formed coupling 62 so that the evaporator may he closed from the suction line. Thus the plug mav he used for closing the inlet or outlet the evaporator. desirable to diso nect the evaporator from the remainder he system, theplug 8! is used for closing t or the evaporator and the shut-off be used for closing the inlet. Thus the evaporator may he charged with refrigandshipped for installation independently of the compressor unit or it can he removed from the system while charged.

TT hile the form of embodiment of the invention as herein disclosed constitutes preferred form, it is to he understood that other rrns he adopted. all coming within e scene of the claims ollow.

' s claimed is as follows:

i. cratin apparatus comprising in n. a rear erant flow control means including means responsive to the condition within said chamber and a valve operatively associated therewith, a housing for said valve, a coupling for connecting said housing with a refrigerant circulating means, said housing having an opening through which said valve can be removed, a removable cover for said opening, and a shut off valve between said-first valve and float chamber for preventing the escape of refrigerant from the chamber when the cover is removed.

2. Refrigerating apparatus comprisin in combination, a refrigerant chamber, re rigerant flow control means including means responsive to the condition within said chamber and a valve, a housing for said valve, a conduit between said housing and chamber, operating connection between said condition responsive means and valve passing through said conduit, a coupling for connecting said housing with a refrigerant circulating means, said housing having an opening through which said valve can be removed, a removable cover for said opening, and a shut off valve between said firstvalve and float chamber for preventing the escape of refrigerant from the chamber when the cover is removed.

3. Refrigerating apparatus comprising in combination, a refrigerant chamber, refrigerant flow control means including means responsive to the condition within said chamber and a valve, a housing for said valve, a conduit between said housing and chamber, operating connection between said condition responsive means and valve passing through said conduit, a coupling for connecting said housing with a refrigerant circulating means, said housing having an opening through which said valve can be removed, a removable cover for said opening, a shut ofl valve in said conduit, and a shut off valve between said first valve and float chamber for preventing the escape of refrigerant.

4. Refrigerating apparatus comprising in combination, a refrigerant chamber, refrigerant flow control means including means responsive to the condition within said chamber and a valve, a housing for said valve, a coupling for connecting said housing with a refrigerant circulating means, a conduit between said housing and chamber, operating connections between said condition responsive means and valve including a member extending through said conduit, a shut ofl valve element carried by said member for closing said conduit, said housing having an opening through which said first valve can be removed, a removable cover for said opening, and means for actuating said member for moving said valve element to closed position for preventing the escape of refrigerant from the chamber when the cover is removed.

5. Refrigerating ap aratus comprising in combination, a float c amber for liquid refrigerant, a valve housing having an opening, a conduit between said housing and float chamber, a shaft extending through said conduit, a valve detachably carried by the shaft within said housing and removable through said opening, a float within the float chamber.

operatively connected with the shaft, a coupling for connecting said housing with a refrigerant circulating means, a removable cover for said opening, and a shut ofl valve for said conduit for preventing the escape of refrigerant from the chamber when the cover is removed.

6. Refrigerating apparatus comprising in combination, a float chamber for liquid refrigerant, a valve housing having an opening, a conduit between said housing and float chamber, a shaft extending through said conduit, a valve detachably carried by the shaft within said housing and removable through said opening, a float within the float chamber operatively connected with the shaft, a coupling for connecting said hous ing with a refrigerant circulating means, a removable cover for said opening, a shut off valve element carried by the shaft for closing said conduit, and means for moving said shaft to conduit closing position.

7. Refrigerating apparatus comprisin in combination, a float chamber for liquid re igerant, a valve housing having an opening, a conduit between said housing and float chamber, a shaft extending through said conduit, a valve detachably carried by the shaft within said housing and removable throu h said opening, a float within the float cham er operatively connected with the shaft, a coupling for connecting said housing with a refrigerant circulating means, a removable cover for said opening, a shut off valve element carried by the shaft and movable longitudinally for closing said conduit, and means for moving said shaft longitudinally to conduit closing position.

8. Refrigerating apparatus comprising in combination, a refrigerant chamber having an inlet and an outlet, a valve for controlling the flow through said inlet and a valve for controlling the flow through said outlet, and a single means for controlling either of said valves. i q

In testimony whereof I hereto afix my signature. 0 

